"WebGL is basically an initiative to bring 3D graphics into web browsers natively, without having to download any plugins. This is achieved by adding a few things to HTML5, namely, defining a JavaScript binding to OpenGL ES 2.0 and letting you draw things into a 3D context of the canvas element." Also see the press release for more details.

Architecture? Interior design? Chemical engineering? There are many industries and uses for this technology, just as I'm sure there are hundreds of thousands of people with unique ideas on how to use them.

...an application that is suppose to give text to the user.

You may not have noticed but it's become a whole lot more important than that in the past fifteen years. :-)

I agree on your point of accessibility; being 3d, low-vision sufferers shouldn't be disadvantaged as the canvas can be scaled without loss of quality. The blind would have a more difficult time and I forsee an opportunity for someone to develop software that can interpret this 3d data into a tactile representation.